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The end of adolescence and the beginning of adulthood varies by country and by function.
Late maturing boys can be less confident because of poor body image when comparing themselves to already developed friends and peers.
Cognitive advances encompass both increment in knowledge and in the ability to think abstractly and to reason more effectively.
The study of adolescent development often involves interdisciplinary collaborations.
Puberty occurs through a long process and begins with a surge in hormone production, which in turn causes a number of physical changes.
It is the stage of life characterized by the appearance and development of secondary sex characteristics (for example, a deeper voice and larger adam's apple in boys, and development of breasts and more curved and prominent hips in girls) and a strong shift in hormonal balance towards an adult state.
A thorough understanding of adolescence in society depends on information from various perspectives, including psychology, biology, history, sociology, education, and anthropology.